US natural gas drilling boom linked to pollution and social strife

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Hydraulic fracturing - or fracking - has been implicated in pollution incidents across the US, leading to widespread protests. Photo: LT Mayers
The gas stored in the Marcellus Shale formation is the subject of desperate drilling to secure US domestic energy supplies. But the process involved - hydraulic fracturing - is the focus of a bitter dispute over environmental damage and community rights
 

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